Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17428#discussion_r108101023
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -90,6 +90,7 @@ trait PredicateHelper {
* Returns true iff `expr` could be evaluated as a condition within join.
*/
protected def canEvaluateWithinJoin(expr: Expression): Boolean = expr
match {
+ case l: ListQuery => false
--- End diff --
add some comments to explain why `ListQuery` should always return false
even the children is empty.
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